Catechism of the Catholic Church §2443 — excerpt
God blesses those who come to the aid of the poor and rebukes those who turn away from them: "Give to him who begs from you, do not refuse him who would borrow from you"; "you received without pay, give without pay."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.